IMPORTANT NOTICE REGARDING THE WAVEWATCH III® MULTI-1 WEBSITE
The EMC WAVEWATCH III®
global wave model Multi-1 was
decommissioned in NCEP operations on March 22, 2021. It has been
replaced by a new configuration of the WAVEWATCH III global wave
model, called GFS-Wave, and coupled to the
Global Forecast System (GFSv16)
, as part of the
Unified Forecast System.
THIS WEBSITE IS NOT DISPLAYING MULTI-1 OR GFS-WAVE GRAPHICS
It is being maintained for archival and verification purposes only.
Here are the details (PDF) on how this will affect users of this site.
Output of the new GFS-Wave model is available on NOMADS and Production FTP
*under gfs.YYYYMMDD/CC/wave/gridded and gfs.YYYYMMDD/CC/wave/station
Graphics of the GFS-Wave model output will become available some time in April on the
Model Analysis and Guidance (MAG) site. Note
that the current WW3 link on that page is to a preliminary set of GFS-Wave
graphics. New graphics with more options will be added with the coming
update in May, and will be under GFS-Wave instead of WW3.
The Global Wave Ensemble System (GWES) was discontinued on 23
Sep 2020 and has been replaced by an improved GEFS-Waves,
consisting of a one-way nesting of the WAVEWATCH III system with
the recently upgraded GFS Ensemble Forecast System. The NOAA
press release on the upgrade is
, and information on GEFS is available
The GEFSv12 Service Change Notice (issued 8/20/2020, PDF) is
, and you can find information on the evaluation of the GEFS-Waves portion
of the GEFS system in the
Model Evaluation Group (MEG)
Summary page on the
The model data is available four times a day (0, 6, 12, 18)Z from:
Production FTP (gefs.YYYYMMDD -->cycle-->waves)
NOMADS (Ocean Models-->GFS Ensemble Wave-->(grib filter or https file download).
Details on the products can be found
(scroll down to GEFS - Wave - Global).
The Global Wave Ensemble System (GWES) is now unified with the Global
Ensemble Forecast System (GEFS). The WAVEWATCH III wave model is
one-way coupled with the atmospheric forecast model. This allows for
an increase in frequency of the wind forcing from 3 hours to 1 hour.
This unified system has 30 members and the wave model is initialized
with the previous member's 6 hour forecast. The wave model has a
spatial resolution of 0.25 x 0.25 degrees. The system runs four cycles
per day (00, 06, 12 and 18Z). The wave forecast has been extended from
10 to 16 days.
More information on the GEFS system is available
Access the Global Ensemble Forecast System -- Wave product viewer
The US National Weather Service also generates operationally a combined wave-height
ensemble product in partnership with the Fleet Numerical Meteorology and Oceanography
Center (FNMOC) of the US Navy. The combined wave ensemble data are at the NFCENS page.